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NCP1608This spreadsheet aids in the design of a boost converter using the NCP1608 (details of the equations are in the datasheet).Note that this is a general tool to assist designers in using the controller; the output is a guideline and does not guarantee the success of a particular system design.SaveOutput PowerPout =100WTarget Efficiency =92%MIN rms Line Input VoltageVacLL =85VacLine voltage used for the chart: Vline =265VacMAX rms Line Input VoltageVacHL =265VacVct(MIN)4.775degv(t)i(t)ton (us)toff (us)freq (kHz)Delta VVrippleTarget Output VoltageVout=400VVregH5.0000.00.001.420.00702-21.06-21.1MIN Switching FrequencyfSW(MIN) =40kHzVregL0.85532.70.051.420.13645-18.00-39.1Icharge2971065.10.091.420.28588-14.99-54.0Ibias1001597.00.141.420.46532-12.03-66.1Input rms CurrentIac =1.28AIcs0.520128.20.181.420.67477-9.15-75.2Inductor Peak CurrentIL(peak) =3.62AIcc(startup)2425158.40.231.420.93424-6.37-81.6Inductor rms CurrentIL(RMS) =1.48AVcc(on)12.0030187.40.271.421.25373-3.71-85.3Output Diode rms CurrentID(RMS) =0.75AICL_NEG10.0035215.00.311.421.65325-1.20-86.5MOSFET rms CurrentIM(RMS) =1.27AVUVP0.3140240.90.341.422.162791.14-85.445265.00.381.422.802373.31-82.0MAX Calculated Inductor ValueL(MAX)_C =509mHRFB460050287.10.411.423.621985.28-76.8Selected Inductor ValueL =460mHgm10055307.00.441.424.701637.04-69.7MAX On Time (VacLL)ton(MAX) =13.84msVzcd(arm)1.5560324.60.461.426.131328.57-61.1On Time at VacHL and MAX Loadton(HL) =1.42msVREF2.565339.70.481.428.011069.87-51.3Frequency (Peak VacLL, MAX Load)fSW(MIN)LL =50.54kHzVOVP2.6570352.20.501.4210.488410.92-40.4Frequency (Peak VacHL, MAX Load)fSW(MIN)HL =44.3kHz75362.00.521.4213.566711.71-28.780369.10.531.4216.995412.24-16.4Calculated On Time CapacitorCt_c =861pF85373.30.531.4219.944712.51-3.9Selected On Time CapacitorCt =1220pF90374.80.531.4221.154412.518.695373.30.531.4219.944712.2420.8Output Divider Network Bias CurrentIbias(out)100mA100369.10.531.4216.995411.7132.6Calculated Upper Feedback ResistorRout1_C =4.00MW105362.00.521.4213.566710.9243.5Selected Upper Feedback ResistorRout1 =4.00MW110352.20.501.4210.48849.8753.3Calculated Lower Feedback ResistorRout2_C =25.30kW115339.70.481.428.011068.5761.9Selected Lower Feedback ResistorRout2 =25.50kW120324.60.461.426.131327.0468.9Output Voltage UVP DetectionVout(UVP) =49V125307.00.441.424.701635.2874.2Output Voltage OVP DetectionVout(OVP) =421V130287.10.411.423.621983.3177.5MAX Current Sense Resistor for OCPRsense_C =0.138W135265.00.381.422.802371.1478.7Sense Resistor Power DissipationPRsense_C =0.225W140240.90.341.422.16279-1.2077.5145215.00.311.421.65325-3.7173.8LetterStartup ResistorRstart =660kW150187.40.271.421.25373-6.3767.4Vcc CapacitorCVCC =47.0uF155158.40.231.420.93424-9.1558.3Startup Timetstartup =3.57s160128.20.181.420.67477-12.0346.216597.00.141.420.46532-14.9931.2Output CapacitorCbulk =68mF17065.10.091.420.28588-18.0013.2AC Line Frequencyfline =47Hz17532.70.051.420.13645-21.06-7.8Peak-to-Peak Output Voltage RippleVripple(peak-peak) =12.45V1800.00.001.420.00702-24.12-31.9Output Capacitor rms CurrentIC(RMS) =0.70ACrossover Frequencyfc =5HzCompensation CapacitorCCOMP_C =3.18mFSelected Compensation CapacitorCCOMP=3.30mF3.30MAX Calculated Boost to ZCD Turns RatioNB:NZCD_C =16.3Selected Boost to ZCD Turns RatioNB:NZCD =10MIN Value of RzcdRZCD(MIN) =3.75kW

Needs to be lessthan or equal to L(MAX)_c

NCP1608

freq (kHz)Instantaneous Input Voltage (V)fSW (kHz)

NCP1608 Design SpreadsheetRev. 2.0 - Skyler Covington June 2009Rout1 = 4 MWRout2 = 25.5 kWCt = 1220 pFCCOMP = 3.3 mFRsense = 0.138 WPRsense = 0.225 WRZCD >> 3.75 kWNB:NZCD = 10L = 460 mHIL(RMS) = 1.48 AID(RMS) = 0.75 AIM(RMS) = 1.27 AIC(RMS) = 0.7 ACbulk = 68 mFRstart = 660 kWCVCC = 47 mFIac = 1.28 ANCP1608Vline = 85 - 265 VacPout = 100 WVout = 400 VMust be greater than or equal to Ct_c